That would depend on what they are gallons of. Different liquids have different weights. Water with nothing mixed into it weighs a bit over 8 gallons per pound.
42 gallons of water is 350.7 pounds
10 US gallons is approximately 83.5 pounds
30 pounds of water is 3.593 gallons.
10 gallons of water is 83.5 pounds
That depends on what substance you have 227.5 pounds of.227.5 pounds of air fills many, many gallons.227.5 pounds of water fills about 27.2 gallons.227.5 pounds of granite fills only a few gallons.
20 gallons of water weighs 167 pounds.
4o pounds
417.5 pounds for 50 US gallons.
About 334 pounds for 40 US gallons.
18 gallons of water is 150.3 pounds.
6,789 pounds of plain water would be about 813.5 gallons.
About 25 pounds for three US gallons of water.